[Webkit-unassigned] [Bug 67537] Implement a ProgressEvent constructor for JSC

bugzilla-daemon at webkit.org bugzilla-daemon at webkit.org
Tue Sep 6 17:27:39 PDT 2011


--- Comment #6 from Cameron McCormack <cam at mcc.id.au>  2011-09-06 17:27:39 PST ---
Yes, you can only represent unsigned long long values in the range [0, 2**53-1] exactly in JS.  Your test could validly assert that 18446744073709551615 comes out as 18446744073709552000.  (Well, I didn't check that second number but I assume it's the closest integral double to 2**64-1.)

We discussed introducing a 53-bit integer type in Web IDL at one point, but it never got added in the end.

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